the prices and functions of different types of puters before you make up your mind which to buy.
A. To pare
B. Comparing
C. Compared
D. Compare
网友回答
A. To pare
B. Comparing
C. Compared
(答案→)D. Compare
解析：考查祈使句。句意:在你下定决心要买某台电脑之前，你要比较一下不同的电脑的价格和功能。祈使句表示的一种语气，使用时，要把动词原形放在句首。故D正确。